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diff --git a/src/lib/crypto/sm2.h b/src/lib/crypto/sm2.h
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+/*-
+ * Copyright (c) 2017-2022 Ribose Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef RNP_SM2_H_
+#define RNP_SM2_H_
+
+#include "config.h"
+#include "ec.h"
+
+typedef struct pgp_sm2_encrypted_t {
+    pgp_mpi_t m;
+} pgp_sm2_encrypted_t;
+
+namespace rnp {
+class Hash;
+} // namespace rnp
+
+#if defined(ENABLE_SM2)
+rnp_result_t sm2_validate_key(rnp::RNG *rng, const pgp_ec_key_t *key, bool secret);
+
+/**
+ * Compute the SM2 "ZA" field, and add it to the hash object
+ *
+ * If ident_field is null, uses the default value
+ */
+rnp_result_t sm2_compute_za(const pgp_ec_key_t &key,
+                            rnp::Hash &         hash,
+                            const char *        ident_field = NULL);
+
+rnp_result_t sm2_sign(rnp::RNG *          rng,
+                      pgp_ec_signature_t *sig,
+                      pgp_hash_alg_t      hash_alg,
+                      const uint8_t *     hash,
+                      size_t              hash_len,
+                      const pgp_ec_key_t *key);
+
+rnp_result_t sm2_verify(const pgp_ec_signature_t *sig,
+                        pgp_hash_alg_t            hash_alg,
+                        const uint8_t *           hash,
+                        size_t                    hash_len,
+                        const pgp_ec_key_t *      key);
+
+rnp_result_t sm2_encrypt(rnp::RNG *           rng,
+                         pgp_sm2_encrypted_t *out,
+                         const uint8_t *      in,
+                         size_t               in_len,
+                         pgp_hash_alg_t       hash_algo,
+                         const pgp_ec_key_t * key);
+
+rnp_result_t sm2_decrypt(uint8_t *                  out,
+                         size_t *                   out_len,
+                         const pgp_sm2_encrypted_t *in,
+                         const pgp_ec_key_t *       key);
+#endif // defined(ENABLE_SM2)
+
+#endif // SM2_H_